CoinMarketCap.com is on of the best sites to follow the movements of all the major and smaller cryptocurrencies. You can find information about the different cryptocoins and assets, their rankings, charts, values and price movements.

CoinMarketCap tracks most of the alternative coins that has hit the market as well as Bitcoin and shows the current value in USD and BTC for each cryptocoin.

CoinMarketCap has a forum thread in Bitcointalk.org where everybody who has created their own altcoin are welcome to suggest having their coin added to the website.